Directed evolution of Anabaena variabilis phenylalanine ammonia-lyase (PAL) identifies mutants with enhanced activities.

Zachary Js Mays, Karishma Mohan, Vikas D Trivedi, Todd C Chappell, Nikhil U Nair

Chemical communications (Cambridge, England) 2020 May 14

filter terms:

There is broad interest in engineering phenylalanine ammonia-lyase (PAL) for its biocatalytic applications in industry and medicine. While site-specific mutagenesis has been employed to improve PAL stability or substrate specificity, combinatorial techniques are poorly explored. Here, we report development of a directed evolution technique to engineer PAL enzymes. Central to this approach is a high-throughput enrichment that couples E. coli growth to PAL activity. Starting with the PAL used in the formulation of pegvaliase for PKU therapy, we report previously unidentified mutations that increase turnover frequency almost twofold after only a single round of engineering.

Citation

Zachary Js Mays, Karishma Mohan, Vikas D Trivedi, Todd C Chappell, Nikhil U Nair. Directed evolution of Anabaena variabilis phenylalanine ammonia-lyase (PAL) identifies mutants with enhanced activities. Chemical communications (Cambridge, England). 2020 May 14;56(39):5255-5258